Support for running the testsuite in command line programs for continuous integration.

Here is a small example inspired from SDLmain.c:

g_launcher = new JGameLauncher();
InitGame();
MTGCollection()->loadFolder("sets/primitives/");
MTGCollection()->loadFolder("sets/", "_cards.dat");
options.reloadProfile();
TestSuite testSuite("test/_tests.txt");
int result = testSuite.run();
DestroyGame();
delete g_launcher;
return result;

projects/mtg/src/GameStateDuel.cpp

@@ -1097,7 +1097,7 @@ void GameStateDuel::Render()
                 char buf[4096];
                 mFont->SetColor(ARGB(255,255,255,255));
 
-                int elapsedTime = (testSuite->endTime - testSuite->startTime);
+				int elapsedTime = testSuite->getElapsedTime();
                 sprintf(buf, "Time to run the tests: %is", elapsedTime/1000);
                 mFont->DrawString(buf,0,SCREEN_HEIGHT/2 - 20);